Bushing.



W. R. ANDERSON.

BUSHING.

APPLIOATIOH Hum JUNE 2, 1910.

Patented May 30, 1911.

WILLIAM R. ANDERSON, 0F CLEVELAND; OHIO.

BUSHING.

Specification of Letters Patent.

Patented May 30, 1911.

Application filed J'une 2, 1910 Serial No. 564,590.

To all whom it may concern:

Be it known that I, VILLIAM R. ANDER- son, a citizen of the UnitedStates, residing at Cleveland, in the county of Cuyahoga and State ofOhio, have invented certain new and useful Improvements in Bushings, ofwhich the following is a specification.

This invention relates to bushings adapted for use in connection withthreading die stocks for the purpose of centering and guiding the pipeor other work with respect to the die, and it is adapted to be appliedto various known die stocks without the trouble and expense of providingand using a separate set of bushings according to the various sizes ofwork.

The invention provides a bushing which includes or comprises a set ofjaw pieces which ma be advanced or retracted to fit pipes of ciiferentsizes by means of an adjusting ring with curved slots which engage pinsattached to the jaws for the purpose of moving said jaw pieces radially,and the device further comprises simple and convenient means forclamping said jaws in adjusted position.

By means of the device, straight threads may be cut on all sizes ofpipes and bolts that the stock will take.

The invention is illustrated in the accompanying drawings in which--Figure 1 is a plan view of the bushing. Fig. 2 is a side view. Fig. 3 isa central longitudinal section thereof.

Referring specifically to the drawings 7 indicates the bushing sleevewhich is adapted to fit onto or over the collar of the die stock, whereit may be fastened in any suitable manner, as by a screw in the hole 10.This sleeve has integral therewith a series of radial casings or ways 2which serve as guides for the sliding jaws or clamping pieces 4 whichwork through openings in the sleeve or barrel 7 and are adapted tocenter a pipe or other piece of work located in said sleeve. The casings2 have radial slots 12 for pins 6 which extend through said slots andalso through the jaw pieces 4 in which the pins are tightly fitted. Anannular plate 1 fits on the outer end of the sleeve and against the jaws4, the ways or guides 2 being open on the side toward the ring so thatsaid ring may be clamped against said jaws, and this ring or plate has aseries of slots 5, spirally arranged and corresponding in position tothe jaws 3, and the ends of the pins 6 project into these slots, and acam closing or opening action of the jaws is effected when said ring isturned on the sleeve. The ring may be held at adjustment, and clampedagainst the jaws to fasten the same by means of a lock nut 3 whichscrews on the outer end of the sleeve, which is threaded as indicated at9 for that purpose. The nut has wings 8 whereby it may be turned.

In the use of the device, the bushing being first placed on the collarof the stock and the work inserted, the ring is turned to advance thejaws by means of the inclined slots and connecting pins, and the jawswhen fully advanced center the work in position, after which theclamping nut 3 is turned to hold the parts fast.

The ring 1 may be removed and reversed to make its action either rightor left handed, and the ways 2 in which the jaws slide insure correctalinement and position of said jaws. By manipulation of the single nut 3the plate can be readily tightened or loosened, making the bushinginstantly available for adjustment according to the work at hand. Thebushing can remain on the stock at all times, and by making the camplate and jaws of steel the durability of the device is assured, and thepipe will always be centered perfectly.

The pins 6 are provided with flat heads 6, on the ends adjacent the slot12, and these flat heads serve to keep the pins securely and in properalinement in the slots 12.

Having thus described the invention,what I claim as new and desire tosecure by Letters Patent is z- A bushing for a die stock, comprising asleeve having radial ways and guide slots in one side of said ways, aremovable ring mounted to turn on the sleeve on the opposite side ofsaid ways, and having cam slots, jaws slidable radially in the ways,pins projecting from the jaws into the guide slots In testimony whereof,I do afiix my signaat one end and into the cam slots at the ture inpresence of two Witnesses. opposite end, the ends of the pins in theWILLIAM R ANDERSON guide slots having heads engaging the Ways to holdthe jaws in the Ways When the ring Witnesses:

is removed, and means to clamp the jaws STEDMAN J. ROCKWELL, asadjusted. EVA M. BOVVDEN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, D. G.

